Presented are: a thermal radiator capable of adjusting a radiant energy wavelength of the thermal radiator through a simple process and increasing radiation efficiency of a desired wavelength area; and a manufacturing method therefor. According to the present invention, the thermal radiator comprises: a thermal radiation unit for emitting internal energy as radiant energy; and a thermal radiation promotive layer located on an energy emission surface from which the radiant energy of the thermal radiation unit is emitted, and including a first photonic crystal layer, of a two-dimensional form, having a first refractive index, and a second photonic crystal layer, which has a form corresponding to the two-dimensional form and has a second refractive index different from the first refractive index.